is 2 5051987 - 1
has 1520800 decimal digits
takes 0.700 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L817301AF558CF31Bdouble-checked
PRP5B6450C42D203CFAverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272189.298568.0556%30000094500000.16052.9513%189.459068.9983%0.9428%
PrimeNet2610.060862.2951%220005000000.00973.4042%0.070563.5786%1.2835%
GPU722651.444164.6154%340007000000.01412.4202%1.458365.4718%0.8564%
Difference+7+187.8544+3.4402%+266000+8750000+0.1464+0.5311%+188.0008+3.5266%+3.5266%

Known prime factors (1 factor, 75.8 bits, 0.00149974% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5051987642851786661611241788472375.7676362365804401429
32 × 19 × 359 × 1621 × 63935941
2021-11-011621639359411,734.00.70041.3076

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2006-01-15T00:00:00Jocelyn Larouchev4_computers1000010000---0.002--0.076%
2009-07-28T14:28:00harleeP4_260055000907500---0.020--1.154%
2017-03-08T06:17:31Squeeky_Squirreli5-5250U_1600300000945000012---0.160--2.951%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-11-01T20:01:39ATH5960X25000009250000027P-12375.7671.730


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-05-16T00:00:00ANONYMOUSv4_computers21261--0.061--
2016-02-23T16:39:07Mark RoseManual testing261263--0.255--
2014-09-03T01:17:00krackerManual testing263264--0.389--
2014-09-14T19:48:00monstManual testing264265--0.740--
2015-08-01T23:20:00snme2pm1Manual testing265266--1.479--
2016-05-20T16:48:09Gordon SpenceManual testing266267--2.958--
2018-06-11T12:29:28ramgeisManual testing267268--5.917--
2021-02-15T11:24:42TJAOIManual testing268269--11.83--
2021-03-27T16:29:58-Anonymous-Manual testing269270--23.67--
2021-03-27T16:29:58-Anonymous-Manual testing270271--47.33--
2021-04-02T16:28:04-Anonymous-Manual testing271272--94.67--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.29074.802%
25500000.02697.410%
302500000.00299.839%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.897


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-28T00:00:00ANONYMOUSv4_computers817301AF558CF31B0.700
2000-04-12T00:00:00ANONYMOUSv4_computers817301AF558CF31B0.700


PRP results:
dateuseridcompidcofactorsres64PRP
2021-11-02T01:27:49ATHec2-PRPCFDC
64285178666161124178847
5B6450C42D203CFAno


P-1 factor-bounds graph:
B1 = 2500000, B2 = 92500000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 300000, B2 = 9450000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 55000, B2 = 907500 (P-1 stage 2)
B1 = 55000 (P-1 stage 1)
B1 = 10000 (P-1 stage 1)
102
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102
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104
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108
TF factor-bounds graph:
272
271
270
269
268
267
266
265
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263
261
250
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270
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2100
Last modified: 2021-11-02T01:27:49+00:00